Malicious PDF — malware analysis report

Static analysis result for SHA-256 965b047a3c1026a3…

MALICIOUS

PDF

77.3 KB Created: 2021-01-07 03:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 733b20db59264e7678555e148d0ad1c8 SHA-1: 1d7cb87b3cbf46c51a22cf1bfae63b5bcb6fd296 SHA-256: 965b047a3c1026a34ea6deec9fcca4920dcf78a75d3806c4767216466199285e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffnew.ru/123?utm_term=niles+si-275+manual PDF link annotation
    • https://cdn.sqhk.co/kobedobofepo/xGgj7SR/minecraft_unblocked_free_just_for_you.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/sixibano-dagapededodav.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/wesasokunujilesi.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/TShhgjg/washington_capitals_hockey_game_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/59jdibo/exogenous_infection_also_known_as.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422168/normal_5fedaae2c9f8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bisiku/pdf_split_portable_apps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8194b60-816b-4993-9b41-e9188cfff095/83087214980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28040380-e3ba-46a6-99f2-259c75da97cf/3689494656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f647ae-e920-4149-a94c-2273f6ccf87d/hormone_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce23eeb1-ddac-42a6-b6b9-882bf2b9b430/somerset_county_pa_recorder_of_deeds_fees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369f6952-0a7d-441e-8d7d-558f1c0cf1d3/8572794181.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 4764 bytes
SHA-256: 874ed87b63f2a88ba260f24507d361f4535b20408ce2b8052f95251d252d4715
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 12480 bytes
SHA-256: fca0182263728891b20af149fce45fe9c2aae249cf5234882dcae13f1d7d05c7
font_02_sfnt_off000118f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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